This would probably lead to a nerf of the damage then.
It would practicly mean that she cannot hit a minion with her w.
As Jotakob says, it should probably just be the one who is charmed.
Maybe like this:
Charmed champion>Charmed minion>Champion>Minion.

I enjoy the game. After reading all these posts in here, most people seem to hate the game bacause of the community.
I find myself enjoying even games with flamers. I try to convince them that flaming won't help his team win the game.

Alistar, Lulu, Morgana, Thresh. All champions that counter her more or less.

Alistar: If engaged on, he will cc you and eventually kill you (can knock you back into tower). If adc gets jumped, you simply use w on their adc and q on the leona. Then the adc won't deal any dmg to the target and the leona passive won't proc.

Lulu: This comes down to timing. Either you want to avoid getting hit by leona e, or you can time your w on leona before she lands stun. If she engages on the adc and you dont hit w before the stun, use the w on enemy adc and you will as with alistar avoid the leona passive proc. From here, you just wanna poke her out of lane.

Morgana: Poke and use spellshield whenever leona jumps on either you or your adc. When leona has used e, she has no engage, so here you wanna trade as much as possible.

Thresh: You basicly wanna poke her out of lane and engage when enemy botlane is low on HP. When she engages with e, you use your own e to throw her back, so she doesn't land on you or the adc.

He is NOT the only one.
Me and one of my friends had 136-139 constant ping today.
If you go to www.pingtest.net, you can see your actual ping (remember to pick a server close to riot's). Mine was 26.
Something is happening on the EuW server.